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前言 K24合金为航空发动机一级涡轮叶片用材。它具有较高的热强性,但它含有较多的Co、Cr、Mo等元素。合金饱和度大,在长期使用过程中,往往有σ相析出,对室温冲击韧性、拉伸强度和塑性恶化影响显著。叶片使用一定期限,有大量σ相析出后,能否消除或降低σ相的有害影响,提高其返修寿命,是本文研究的目的。一、试验材料和方法试验用料成分见表1。资料〔1.2〕认为叶片尺寸因素有时显著地影响合金的原始结构。还指出,在一定条件下,铸件尺寸对σ相析出起主导作用。因此,为模拟叶片榫齿部位尺寸,用12×12mm柱形试样和在铸盘上取样,经热处理后,观察显微组织。叶片使用一定期限后,各部位会析出程
Preface K24 alloy for aero-engine turbine blade timber. It has high thermal strength, but it contains more Co, Cr, Mo and other elements. Alloy saturation, in the long-term use of the process, often precipitation of σ phase, impact toughness at room temperature, tensile strength and plastic deterioration significantly. The use of leaves for a certain period, a large number of σ phase precipitation, whether to eliminate or reduce the harmful effects of sigma phase, improve their repair life, is the purpose of this study. First, the test materials and methods Test materials ingredients in Table 1. Data [1.2] suggested that leaf size sometimes significantly affects the original structure of the alloy. Also pointed out that under certain conditions, casting size plays a leading role in the precipitation of σ phase. Therefore, to simulate the size of the blade tenon teeth, a 12 x 12 mm cylindrical specimen was taken and sampled on the cast pan. After heat treatment, the microstructure was observed. Leaves a certain period of time, the various parts of the process will be out